Bump the dependencies group with 2 updates (acquia#1681)

Bumps the dependencies group with 2 updates: [symfony/flex](https://github.com/symfony/flex) and [phpro/grumphp](https://github.com/phpro/grumphp).


Updates `symfony/flex` from 2.4.3 to 2.4.4
- [Release notes](https://github.com/symfony/flex/releases)
- [Commits](symfony/flex@v2.4.3...v2.4.4)

Updates `phpro/grumphp` from 2.4.0 to 2.5.0
- [Release notes](https://github.com/phpro/grumphp/releases)
- [Commits](phpro/grumphp@v2.4.0...v2.5.0)

---
updated-dependencies:
- dependency-name: symfony/flex
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dependencies
- dependency-name: phpro/grumphp
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>